Piston-rod packing



(No Model.) I

S. D. THURSTON.

PISTON ROD PACKING. No. 318,400. Patented May 19, 1885,.

Warren dramas ATENT OFFICE.

SPENCER D. THURSTON, OF PHILADELPHIA, PENNSYLVANIA.

PISTON-ROD PACKING.

@IEfiIIPICATIOI" forming part of Letters Patent No. 318,400, dated May 19, 1885.

Application filed March 3, 1885.

To all whom it may concern:

Be it known that I, Srnxonn D. THURSTON, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Piston-Rod Packing and Glands Therefor; and I do hereby declare that the following is a full, clear, and exact description of. the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyj drawings, and to the letters of reference marked thereon, which form part of this specification.

My invention relates to that class of rodpacking in which a self-adjusting packing is held in the stuiiiug-box by a divided box, the divided box being held by the ordinary stuifing-box gland.

It consists of certain novel features that will be specifically described in the specification and particularly claimed at end thereof.

Figure 1 is a vertical section of the packing, the striding-box being shown on the bottom end of the cylinder. Fig. 2 is a section of the divided packing box, showing the screws in dotted lines for holding the two parts together. Fig. 3 is an end view of the packing-box with the screws in dotted lines. Fig. 4 is a section through line a: 00, Fig. 1. Fig. 5 is a top viewof the small sectional packing-ring, and Fig. 6 is a similar view of the large packing-rings.

A is an ordinary stufiing-box with its gland B and studbolts O. In this stuffing-box is inserted a longitudinally-divided packingbox, D, which is divided vertically for the purpose of placing the box in position without disengaging the piston-rod from its cross head. The box is held together by screws a, (shown in dotted lines,) the holes being countersunk, so that the heads will be below the surface of the box. Upon the inside of the box, next to the rod, is formed two or more recesses, E, which form separate compartments when in position, and into which the packing rings and springs are placed, and up on the outer end of the box is a flange, F, which rests upon the outer end of the stuffingbox, and between which a gasket of suitable material may be placed; or a ground joint may be made to prevent any leaking of steam between the packing-box and stufiingbox, the parts being held in position by the gland.

G G are the large packing-rings, as shown (N0 model.)

in Fig. 6, triangular in section and in two or more pieces, for the same purpose as the division of the box. These rings are recessed in their corners adjoining the rods and box for the insertion of small rings H, which are square in section. These rings are also divided, and when in position they breakjoint with the large rings, being held in place by dowelpins b. Two of the large rings, with the small rings in position, are placed in each recess of the packingbox. The right-angle faces of the rings coming in contact with the rod and box causes the inclined faces to form an angular recess, into which a coiled spring or springs. I, are inserted, which causes the rings to close the space between the rod and box, thereby preventing any escape of steam or water. \Vhen two springs are used, a plate, 0, is inserted between the rings to keep the coils from slipping between each other. The small and large packing-rings are made of any suitable but different material. The chamber K in the stuffing-box will retain some of the water of condensation, which will act as a lubricant; or a lubricant can be supplied to the chamber by the pipe d.

Having described my invention, what I claim is- 1. In a rod-packing, the combination of the longitudinally-divided packingbox having recesses formed therein with the packing rings and springs, substantially as described.

2. In a rod-packing, the combination of the paeking'box having recesses that form separate compartments with the two rings triangular in section in each compartment and the coilspring, substantially as described.

3. In a rod-packing, the combination of the box having separate compartments with four rings in each compartment, two being triangular and two square in cross-section, and the coiled spring, all arranged substantially as shown and described.

4. In a rod-packing, the combination of the packing-box having separate compartments and provided with a flange at one end with the rings, the striding-box, and the gland secured to the lower portion of the packing-box by bolts or rods, substantially as described.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

WVitnesses: SPENCER D. THURSTON.

JAMES ONEILL, W. W. GRAHAM. 

